Rigify : skin overlapping clothes
This is a common issue in automatic weighting. There is no "one click solution", so I can only propose some tips to improve your weighting skills:

1 - put your subsurf modifier after (down) the armature modifier and enable two little buttons that let you see the changes you'll make in edit mode and weight painting mode.



2 - in edit mode, if you select one vertex you can read the weight assigned to every bone - vertex group in the "N" panel, vertex weight tab.


3 - in edit mode select some vertices (tipically some edge rings), then switch to weight paint mode and click the red highlited button: your weight painting will apply only to the selected vertices


4 - if you select some vertices you can directly assign a weight in the vertex properties, vertex group tab.

Always consider that every vertex is moved by all the bones to which a weight is assigned.

Hope it helps!